"Gaming" motherboard is not a proper term for high-end motherboards or expensive motherboards since motherboards rarely affect performance by a significant amount. There aren't any manufacturers that advertise their boards as "gaming" boards anyway, but rather as boards for overclocking instead.

Anyway, yes, the ASUS P8Z68-V PRO is a pretty good board for its price. It comes with the latest LGA1155 chipset and is also a good motherboard for overclocking . As for the chassis, if you require a chassis with a moderately large space, go with the HAF 922. Otherwise stick to the HAF 912, which is more like a small-medium sized chassis.